Longitudinal beam parameters during acceleration in the LHC.

Longitudinal beam parameters in the LHC being fixed at the lowest and highest energies, up to now still had some freedom during acceleration. In this paper they are defined during acceleration from beam stability considerations. The necessity of continuous emittance blow-up on the ramp proportional to the square root of energy is shown. The requirements for the damping of narrow-band impedances are found to be most critical at injection energy.